rohitg00/ai-engineering-from-scratch · error · ValueError

uncertainties must be a list

Error message

uncertainties must be a list

What it means

Error "uncertainties must be a list" thrown in rohitg00/ai-engineering-from-scratch.

Source

Thrown at certifications/claude/lessons/05-output-evaluation-and-validation/code/main.py:94

        errors.append("schema and totals must use deterministic evaluators")
    release = record.get("release")
    blocker_failures = sum(claim.get("severity") == "blocker" and claim.get("result") == "fail" for claim in claims if isinstance(claim, dict))
    required_failures = sum(claim.get("severity") == "required" and claim.get("result") == "fail" for claim in claims if isinstance(claim, dict))
    if not isinstance(release, dict) or release.get("blockerFailures") != blocker_failures or release.get("requiredFailures") != required_failures:
        errors.append("release failure counts must match claims")
    elif blocker_failures and release.get("decision") != "revise":
        errors.append("blocker failure requires a revise decision")
    elif not str(release.get("nextAction", "")).strip():
        errors.append("release nextAction is required")
    if not isinstance(record.get("uncertainties"), list):
        errors.append("uncertainties must be a list")
    return errors


def summarize(record: dict[str, Any]) -> dict[str, Any]:
    errors = validate_record(record)
    if errors:
        raise ValueError("; ".join(errors))
    results = Counter(claim["result"] for claim in record["claims"])
    return {"claims": len(record["claims"]), "results": dict(results), "decision": record["release"]["decision"], "failedClaimIds": [claim["id"] for claim in record["claims"] if claim["result"] == "fail"]}


def load_record(path: Path) -> dict[str, Any]:
    value = json.loads(path.read_text(encoding="utf-8"))
    if not isinstance(value, dict):
        raise ValueError("record root must be an object")
    return value


if __name__ == "__main__":
    path = Path(__file__).parents[1] / "outputs" / "claim-validation-record.json"
    record = load_record(path)
    print(json.dumps({"valid": not validate_record(record), "summary": summarize(record)}, indent=2))

View on GitHub (pinned to 39ea8a1c6d)

When it happens

Trigger: Thrown at certifications/claude/lessons/05-output-evaluation-and-validation/code/main.py:94 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of rohitg00/ai-engineering-from-scratch@39ea8a1c6d (2026-08-26). Data as JSON: /api/errors/f7e4253032c047f7. Report an issue: GitHub.